The book is hard to understand．________ can be enjoyed from it until you have read it several times．A.NothingB.FewC.SomethingD.Much
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A解析解析：not…until“直到……才”；例如：The villagers did not realize how serious the pollution was until all the fish died in the river．直到河里的鱼死光了，村民才意识到污染的严重。拓展：not…until 句式可变成倒装句或强调句。Not until all the fish died in the river did the villagers realize how serious the pollution was．It was not until all the fish died in the river that the villagers realize how serious the pollution was．